Related Experiment Videos
Hemoglobin measured by Hemocue and a reference method in venous and capillary blood: a validation study
Lynnette Neufeld1, Armando García-Guerra, Domingo Sánchez-Francia
1División de Epidemiología de la Nutrición, Centro de Investigaciones en Nutrición y Salud, Instituto Nacional de Salud Pública, Av. Universidad 655, colonia Santa María Ahuacatitlán, 62508 Cuernavaca, Morelos, México. lneufeld@correo.insp.mx
Salud Publica De Mexico
|July 23, 2002
Summary
Capillary blood hemoglobin (Hb) measurements using Hemocue may underestimate anemia in individuals, despite adequate population estimates. Proper sample collection technique is crucial, especially for children, impacting anemia prevalence findings.
Area of Science:
- Clinical Chemistry
- Hematology
- Public Health
Background:
- Accurate hemoglobin concentration (Hb) measurement is vital for diagnosing anemia.
- Variations in Hb estimates can arise from blood sampling site (venous vs. capillary) and analytical methods.
- Understanding these variations is crucial for reliable anemia prevalence studies.
Purpose of the Study:
- To compare Hb levels measured in venous and capillary blood using Hemocue and an automated spectrophotometer (Celldyn).
- To evaluate the impact of blood type and analytical method on anemia prevalence estimates.
- To assess the diagnostic accuracy (sensitivity and specificity) for anemia.
Main Methods:
- Collected capillary and venous blood samples from 72 adults and children in Mexico.
- Assessed Hb using both Hemocue and Celldyn methods.
- Analyzed data using concordance correlation coefficient and Student's t test; estimated sensitivity and specificity.
Main Results:
- Capillary blood showed higher Hb (+0.5 g/dl) than venous blood.
- Celldyn measurements were higher than Hemocue (+0.3 g/dl).
- Specificity for anemia detection was high (>0.90), but sensitivity was low (<0.80) for capillary blood with Hemocue.
Conclusions:
- Differences in Hb between venous and capillary blood may reflect biological variability.
- Hemocue assessment of capillary Hb adequately estimates population anemia but can lead to false negatives at the individual level.
- Emphasizes the importance of sample collection technique and analytical method choice in field studies, particularly for pediatric populations.